chore: import upstream snapshot with attribution

test/callback_helpers_unittest.cc

@@ -0,0 +1,61 @@
+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "butil/callback_helpers.h"
+
+#include "butil/bind.h"
+#include "butil/callback.h"
+#include <gtest/gtest.h>
+
+namespace {
+
+void Increment(int* value) {
+  (*value)++;
+}
+
+TEST(BindHelpersTest, TestScopedClosureRunnerExitScope) {
+  int run_count = 0;
+  {
+    butil::ScopedClosureRunner runner(butil::Bind(&Increment, &run_count));
+    EXPECT_EQ(0, run_count);
+  }
+  EXPECT_EQ(1, run_count);
+}
+
+TEST(BindHelpersTest, TestScopedClosureRunnerRelease) {
+  int run_count = 0;
+  butil::Closure c;
+  {
+    butil::ScopedClosureRunner runner(butil::Bind(&Increment, &run_count));
+    c = runner.Release();
+    EXPECT_EQ(0, run_count);
+  }
+  EXPECT_EQ(0, run_count);
+  c.Run();
+  EXPECT_EQ(1, run_count);
+}
+
+TEST(BindHelpersTest, TestScopedClosureRunnerReset) {
+  int run_count_1 = 0;
+  int run_count_2 = 0;
+  {
+    butil::ScopedClosureRunner runner;
+    runner.Reset(butil::Bind(&Increment, &run_count_1));
+    runner.Reset(butil::Bind(&Increment, &run_count_2));
+    EXPECT_EQ(1, run_count_1);
+    EXPECT_EQ(0, run_count_2);
+  }
+  EXPECT_EQ(1, run_count_2);
+
+  int run_count_3 = 0;
+  {
+    butil::ScopedClosureRunner runner(butil::Bind(&Increment, &run_count_3));
+    EXPECT_EQ(0, run_count_3);
+    runner.Reset();
+    EXPECT_EQ(1, run_count_3);
+  }
+  EXPECT_EQ(1, run_count_3);
+}
+
+}  // namespace